I agree, TB, Warmblood, or some sort of TB Cross would be good. Honestly, I wouldn't worry too much about the horse's breed. Nail down your price range, and just start going out there and trying out potential horses. Find a well mannered horse, with good feet and legs, who you get along with! Trust me, when you find him, you'll know he's "the one." Oh, and if you want to start jumping him very soon, don't look for anything under 4 (or even 5) years old, so that he's fully developed.
Good luck! And have fun horse-shopping!